Low Voltage Ride-through Technologies in Wind Turbine Generation

In recent years,the proportion of the wind power in the grid is increasing rapidly.When the grids faults results in voltage decline,the widespread tripping of wind generators could lead to transient instabilities and local or overall blackouts.So it is concerned that the wind turbines merge into the grid,and the request of the low voltage ride through(LVRT) ability is proposed.This paper analysises the transient responses of three widely used wind turbine,including fixed speed induction generator(FSIG),permanent magnetic synchronous generator(PMSG) and doubly-fed induction generator(DFIG),and summarizes the LVRT methods adopted home and abroad.The LVRT methods of DFIG are mainly discussed,which is must difficalt.